Added native Miryoku support

[dunk2k]

Description

• added LAYOUT_split_3x5_3 to following variants:
  • 4x5
  • 4x5_5
  • 4x6
  • 4x6_5
  • 5x6
  • 5x6_5
• Removed keymap Manna-harbour_miryoku from all variants where present.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

• n/a

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[fauxpark]

These layouts do not work with the data-driven direction keyboards are being moved in. All keys in a layout must have exactly one matrix position, no more, no less:

☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])
☒ Invalid LAYOUT macro in keyboards/handwired/dactyl_manuform/4x5/4x5.h: Key XXX in macro LAYOUT_split_3x5_3 has multiple matrix positions ([3, 0], [3, 1], [3, 2], [4, 0], [4, 1], [4, 2], [4, 3], [8, 0], [8, 2], [9, 0], [9, 1], [9, 2], [9, 3])

[dunk2k]

Aim is to update/add 'via' keymaps and modernise to data driven format.

In the interim, ethos is to make incremental changes to dactyl manuform keyboard directory(s).

[dunk2k]

Changes made in #20365 supersede changes made in this PR